Helicity balance and steady-state strength of the dynamo generated galactic magnetic field

We demonstrate that the inclusion of the helicity flux in the magnetic helicity balance in the nonlinear stage of galac- tic dynamo action results in a radical change in the magnetic field dynamics. The equilibrium value of the large-scale mag- netic field is then approximately the equipartition level. This is in contrast to the situation without the flux of helicity, when the magnetic helicity is conserved locally, which leads to sub- stantially subequipartition values for the equilibrium large-scale magnetic field.